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New Drug Evaluation Monograph Template © Copyright 2012 Oregon State University. All Rights Reserved Drug Use Research & Management Program Oregon State University, 500 Summer Street NE, E35, Salem, Oregon 97301-1079 Phone 503-947-5220 | Fax 503-947-1119 Abbreviated Class Evaluation: Fat-Soluble Vitamins for the use of Cystic Fibrosis Month/Year of Review: May 2013 End date of literature search: April 2013 Research Questions: Is there evidence to support the use of fat-soluble vitamins for patients with Cystic Fibrosis (CF)? Are certain reformulations of fat-soluble vitamins more effective than safer than individual components or other formulations? Conclusions: There is limited, low quality evidence to demonstrate a benefit or harm with fat-soluble vitamin supplementation in patients with CF. Therapy is guided by consensus recommendations and clinical practice guidelines which all recommend routine supplementation with vitamins A, D, E and K in patients who are pancreatic insufficient with CF. Recommendations: Due to the consensus among CF practitioners of routine supplementation with fat-soluble vitamin preparations in patients with CF, compare and add appropriate formulations (Source CF, Vitamax or ADEK) to the list of supplements that are included in the rebate policy. Further evaluate the vitamin and supplement policy for appropriate exclusions to the rebate list. Encourage CCO’s to evaluate their CF vitamin utilization and adopt similar coverage guidelines. Background: Cystic fibrosis (CF) is the most common lethal genetic disease in white populations and is caused by a mutation in a gene that encodes cystic fibrosis transmembrane conductance regulator protein (CFTR).1 Symptoms appear throughout life with variability in timing and severity. Short and long-term complications include failure to thrive, stunting, wasting, vitamin and mineral deficiencies, recurrent pulmonary infections, decreased lung function, and recurrent hsopitalizations.2 About 85-90% of infants with cystic fibrosis develop pancreatic insufficiency and leads to fat-soluble-vitamin deficiency and malnutrition. The use of pancreatic enzyme replacement therapy can help manage malnutrition; however, adequate caloric intake and fat-soluble-vitamin deficiencies are imperative in controlling disease. 1 Patients with CF also have malabsorption of bile acids, which are necessary for absorption of fat-soluble vitamins.3 Poor absorption of the fat-soluble vitamins (A, D, E, and K) can lead to acrodermatitis, anemia, neuropathy, night blindness, osteoporosis, and bleeding disorders. Although there is limited evidence from randomized controlled trials, standard of care includes supplementation with fat-soluble-vitamins. Many clinical practice guidelines support this. There is a strong correlation between nutritional status and pulmonary function. Water-soluble vitamins are well absorbed and routine supplementation is not necessary. After diagnosis, the goals of CF are to maintain normal growth and development and to delay onset of pulmonary disease. The goal of nutritional treatment of infants in the newborn period is normal growth. 2 Symptomatic vitamin A and vitamin E deficiency has been reported in patients with CF and many newly diagnosed infants have low levels of one or more fat-soluble vitamins. 2 Some particular groups are at a higher risk of having decreased levels. These include patients who are homozygous for F508del and those with hypoalbuminemia or elevated alkaline phosphatase. These vitamins are available as sole supplements as well as in combination form with other vitamins (either as liquid or a tablet). The availability of different formulations differs in different health services. Currently, Cystic Fibrosis Medical Therapy is covered under the Oregon Health Plan prioritized list (Line 28) and there are no specific vitamin policies. Methods: A Medline literature search ending February 2013 for new systematic reviews, clinical guidelines, and randomized controlled trials (RCTs) comparing fat-soluble vitamins in the use of CF was conducted. The Agency for Healthcare Research and Quality (AHRQ), Cochrane Collection, National Institute for Health and Clinical Excellence (NICE), Department of Veterans Affairs, Clinical Evidence, Up To Date, Dynamed, and the Canadian Agency for Drugs and Technologies in Health (CADTH) resources were manually searched for high quality and relevant systematic reviews. The FDA website was searched for new drugs, indications, and safety alerts, and the AHRQ National Guideline Clearinghouse (NGC) was searched for updated and recent evidence-based guidelines. The primary focus of the evidence is on high quality systematic reviews and evidence based guidelines for this class update. RCTs will be emphasized if evidence is lacking or insufficient from those preferred sources. Efficacy Summary: Systematic Reviews: Recently the Cochrane Collaboration completed systematic reviews for the supplementation of fat-soluble vitamins in the treatment of CF. Evidence was extremely limited for all vitamins and ultimately, authors found insufficient high quality evidence and recommended the guidelines be adhered to until further evidence is available. Guidelines from the Cystic Fibrosis Foundation, European Cystic Fibrosis Society, and the UK Cystic Fibrosis Trust currently exist. Author: Megan Herink, Pharm.D. A recent Cochrane systematic review attempted to determine if vitamin A supplementation in children and adults with CF reduces the frequency of vitamin A deficiency disorders, improves general and respiratory health, or increases the frequency of vitamin A toxicity.5 However, the authors only identified one study in their literature search. This was ultimately excluded because it was not placebo controlled. There were no randomized controlled trials identified and therefore authors could not draw any conclusions on the benefits or harms of regular administration of vitamin A in people with cystic fibrosis. They further described that until further data is available, country or region specific guidelines on the use and monitoring of vitamin A should be followed. Another 2012 Cochrane systematic review evaluated vitamin D supplementation in children and adults with CF.6 Three studies were included in the analysis, although only data from two were available. One study compared 800 IU of vitamin D and placebo for 12 months in pancreatic insufficient adults. The two studies showed no clear benefit or harm identified with short-term vitamin D supplementation compared to placebo (n=41). Only effects on bone mineral density (BMD) were evaluated; there were no data on the effects on growth and nutrition. No conclusions on the longer term effects could be drawn from the short term, limited data. Authors conclude there is insufficient evidence to determine a benefit or harm and adherence to relevant CF guidelines should be considered at this time. A third systematic review from the Cochrane Collaboration assessed the effects of vitamin K supplementation in CF to determine the optimal dose and route of administration for routine and therapeutic use.4 Only two trials were included in the review (n=32) and had a moderate risk of bias. Both trials were underpowered and of short duration. Patients were from 8 to 35 years old and all were pancreatic insufficient. Neither trial addressed outcomes of interest including coagulopathy, INR, and bone formation outcome measures. One trial demonstrated that serum vitamin K levels appeared to significantly (p<0.001) with supplementation. There was no statistically significant difference between the 5 mgd/day and 1 mg/day doses (MD -4.46, 95% CI -12.65 to 3.73). Based on these two trials, authors concluded that there is weak and limited evidence to support the use of vitamin K in patients with CF. However, no harm was seen and until further evidence is available, the present guidelines should be adhered to. Clinical Guidelines Cystic Fibrosis Foundation: The Cystic Fibrosis Foundation commissioned an evidence review to develop evidence-based guidelines for management of infants with CF.2 Recommendations were graded using the United States Preventive Health Services Task Force (USPSTF) grading system and made consensus recommendations for topics not included in evidence reviews or for topics for which there was limited or no evidence for. The CF Foundation gives the following recommendations: All infants with CF should receive standard, age-appropriate non-fat-soluble vitamins and vitamins A, D, E, and K as recommended in the CF Foundation Consensus Report on Nutrition for Pediatric Patients. For infants under 2 years of age, the Foundation recommends that multivitamins designed to provide at least the recommended levels of vitamins A,D,E and K for patients should be prescribed, beginning shortly after diagnosis (Low certainty, Moderate benefit, Consensus Recommendation) For infants under 2, the CF Foundation recommends that a trial of zinc supplementation (1 mg elemental zinc/kg/day in divided doses for 6 months) may be given to infants who are not adequately growing despite adequate caloric intake and pancreatic enzyme replacement therapy (Low Certainty, Moderate Benefit, Consensus Recommendation). There is insufficient evidence to recommend for or against supplementation with linoleic acid (Grade I) Author: Megan Herink, Pharm.D. There is insufficient evidence to recommend for or against supplementation with docosahexaenoic acid (Grade I) The CF Foundation updated their Vitamin D guidelines in the treatment of CF due to insufficient
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